I'm told the production run allotment is three years, and my dealer is all sold out. That means by 2010 you'll be lucky to get a used R8 for under $100K.
Possibly in 4-5 years you could see some high mileage R8's in the $70's. By then though, you will probably see some new cars at that price that are much better values.
2006 E60 M5, Dinan 3.91 diff, H&R springs and spacers, resonator and charcoal filters removed, Active Autowerks ECU, Evosport Pulley, BMC Air Filters, RPI cold air scoops. Michelin PS2's on 20" BBS RS-GT's.